Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof

A pre-magnetization and transformer technology, applied in circuits, magnetic objects, electrical components, etc., can solve the problems of large volume, large heat generation, inability to change voltage and phase, etc., to achieve small size, low heat generation, and medium voltage saving. The effect of switchgear

Active Publication Date: 2010-05-05
武汉长海电力推进和化学电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Each phase of the power supply transformer needs an independent resistor, which is relatively large in size;
[0005] 2. High calorific value;
[0006] 3. The voltage and phase cannot be changed, and power must be taken from the power grid at the front end of the power supply transformer

Method used

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  • Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof
  • Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof
  • Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof

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Embodiment 1

[0033] Such as figure 1 In the illustrated embodiment, the premagnetizing transformer 1 is a three-phase transformer connected in parallel with the main circuit breaker 3 at the input end of the power supply transformer 4 . This embodiment is a technical solution for pre-magnetization through the conventional main grid 6 . The pre-magnetization device can be installed in the main body of the power supply transformer on site, or in the power distribution panel. It is especially suitable for limiting the inrush current when a large transformer is put into the grid, so as to protect the grid. The power supply transformer pre-magnetization device described in this embodiment has a pre-magnetization transformer 1 for connecting with the power supply transformer 4; the input end of the pre-magnetization transformer 1 has a pre-magnetization switch device 2 for on-off , the pre-magnetized switching device 2 includes a main contact, a momentary auxiliary contact 2.1 and a time-delay...

Embodiment 2

[0035] Such as figure 2 As shown, the difference from the above-mentioned embodiment 1 is: pre-magnetization schemes for different power grids. The pre-magnetizing transformer 1 is a three-phase transformer whose output end is connected to the input end of the power supply transformer, and whose input end is connected to the output end of the daily transformer 5 . The input voltage amplitude and phase of the pre-magnetizing transformer 1 are the same as those of the daily power grid 7, and the output voltage amplitude and phase are consistent with those of the main power grid 6 on the primary side of the power supply transformer 4, which is selected as 30kVA in this embodiment. The pre-magnetization time range of the pre-magnetization transformer 1 is less than or equal to 30S, which is selected as 30S in this embodiment. The capacity of the pre-magnetizing transformer can also be selected as 5kVA or 10kVA or 20kVA. The transformation ratio and connection method of the pre-...

Embodiment 3

[0038] A method for pre-magnetizing a power supply transformer according to the present invention, the equipment used is the above-mentioned pre-magnetizing device, and the pre-magnetizing procedure is as follows:

[0039] 1) After receiving the closing control pulse signal of the main circuit breaker 3 at the input end of the power supply transformer 4, the pre-magnetization contactor 2 operates to start pre-magnetization;

[0040] 2), at the same time as the above step 1), the instantaneous auxiliary contact 2.1 of the pre-magnetization switch device 2 belonging to the contactor is immediately connected, and the control line package 2.3 of the self-locking pre-magnetization switch device 2;

[0041] 3), after reaching the set delay time, the delay auxiliary contact 2.2 of the pre-magnetization switching device 2 is closed, the main circuit breaker closing coil 3.3 is connected, and the main circuit breaker 3 is closed;

[0042] 4), at the same time as the above step 3), the ...

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Abstract

The invention relates to a pre-magnetizing device of a power supply transformer and a pre-magnetizing method thereof, which are applicable to limiting impulse current when connecting a large transformer into a power grid and further protecting the power supply transformer and the power grid, in particular to being applicable to marine electric propulsion systems. The pre-magnetizing device comprises a pre-magnetizing transformer for connecting with the power supply transformer; and a pre-magnetizing switch device for switching-on and switching-off is arranged at the input end of the pre-magnetizing transformer, and the pre-magnetizing switch device comprises a main contact, an instantaneous auxiliary contact and a delay auxiliary contact. The pre-magnetizing method of the power supply transformer relates to the pre-magnetizing procedure. The pre-magnetizing device has the advantages of small volume, small heat value, simple structure, flexible wiring, safety, stability, in-situ installation in a power supply transformer body or a power distribution screen, low overall cost, convenient replacement and maintenance and the like.

Description

technical field [0001] The invention relates to a power supply transformer pre-magnetization device and a pre-magnetization method thereof, which belong to the technical field of safe power supply and are suitable for limiting the inrush current when a large transformer is put into a power grid, thereby protecting the power supply transformer and the power grid, and making the work stable. Especially suitable for marine electric propulsion systems. Background technique [0002] In the ship power grid, the capacity of the power supply transformer for powering large-capacity loads such as propulsion is equivalent to the capacity of a single unit in the power grid. When the power supply transformer is put into the ship's power grid, its coil does not establish a back electromotive force. For the power grid, the transformer is equivalent to a short-circuit state at this time. The transient short-circuit current may cause the malfunction of the circuit breaker and cause a sudden ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F13/00H02J3/38
Inventor 刘凯柯常国还芳黎波
Owner 武汉长海电力推进和化学电源有限公司
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